Abstract

The classical Gouy double layer theory has been extended to include a double layer present across two media differing in their dielectric constants. Depending on the boundary conditions used for solving the Poisson equation, different conclusions are obtained. In one case, the double layer may be displaced in the outward direction from the surface without changes in the potential values. In the other case, the potentials across the double layers are lower than those of the classical monomedium model.